![]() But what makes this image special are the numerous faint dots filling the sky. Look at this new radio image covered with dots, each of which is a distant galaxy! The brightest spots are galaxies that are powered by supermassive black holes and shine bright in radio light. Because radio waves travel at the speed of light, this image is a time machine that samples the star formation history of the universe. The myriad faint dots are distant galaxies like our own Milky Way, too faint to have been detected before now. ![]() The brightest spots are luminous radio galaxies powered by supermassive black holes. Composite view of an observation showing thousands of galaxies in radio light and the MeerKAT radio telescope array in the South African Karoo semidesert. ![]()
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